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The BMW X4, a baby version of the X6, will have it's official debut at the auto show in China but we have these leaked pictures for you early. This is the first look at the X4 Concept Sport Activity Coupe (SAC) from BWM. The X4 has the styling from the X6 but the sizing of the X3, which is shares a chassis with. It is hard to get a sense of size from the pictures so we have comparison numbers for you.

Size comparisons chart - X4 Concept, X3, X6 and X1

This is just a concept car, but we know that when BMW builds a concept car it is 90% or greater the finished model. The production X4 will get mirrors with integrated turn signals with styling smilare to the F30 3 series. Look for the Line package concept seen on the 3 series to be implemented on the X4 with the front bumper getting different treatment for each of the Lines. The rear bumper styling will also be line dependent. The rectangular exhaust tips will be dropped in favor of more traditional round tips. If the 4 series coupe concept is a guide the X4 production version will end up looking very similar to the F25 X3.

The X4 will be produced at BMW's Spartanburg plant along side the X3, X5 and X6. Expect engine choices to mirror the X3, with a 4 cylinder, 6 cylinder and diesel option. Production and deliveries will not happen until 2014 so you've got time to start saving for your very own X4. Stay tuned for more details as we move closer to production.

The All-New BMW Concept X4 - The latest chapter in the Sports Activity Coupe story
Every BMW SAV has been a trailblazer. The world premiere of the first BMW SAV (the BMW X5) in 1999 saw the BMW Group create the Sports Activity Vehicle (SAV) segment – one in which BMW SAVs remain the market leaders. The BMW X3 and BMW X1 were likewise the first SAVs in their classes, and continue to define these types of vehicles today.

The story of BMW light trucks took on a new dimension in May 2008 with the introduction of the BMW X6 – the first Sports Activity Coupe (SAC). This unique concept brought
together the rugged looks of a BMW SAV with the emotional aura and sporting character of a BMW Coupe for the first time. The enduring popularity of BMW's first SAC is borne out by its consistently high sales figures. The short history of the BMW X range is already a successful one. Since the first BMW SAV took to the stage, average sales across the BMW X line-up have progressed on a constant upward curve: one in four new BMW cars is now a BMW SAV.

With the BMW Concept X4, the BMW Group offers a preview of the future of the BMW X family. It takes no more than a first glance to see how smoothly the qualities of a BMW SAV can blend with the genes of a BMW Coupe. The new Sports Activity Coupe concept from BMW is poised to continue the success story of the BMW X6 in a new vehicle class. Eye catching proportions, tight contours and numerous high-quality details produce an unrivaled product character brimming with emotional appeal, dynamism and the sturdiness you would expect from a BMW SAV, while at the same time holding out the promise of out-standing performance and driving dynamics. All of this can be experienced when the BMW X4 production model rolls out of the factory for its market launch, scheduled for 2014. The second Sporty Activity Coupe in the brand´s model range will be built at BMW Plant Spartanburg in the USA, the competence center for BMW SAVs which also produces the BMW X5, BMW X6 and BMW X3.

The sporting character of the BMW Concept X4 is articulated by its dynamic line work as well as its proportions. With a body length of 183 inches (4,648 mm), a width of 75.4 inches (1,915 mm) and a height of 63.9 inches (1,622 mm), its exterior dimensions signal sporting elegance and powerful robustness. In addition to a long bonnet, short overhangs and set back passenger cell, its signature BMW features include a wheelbase measuring 110.6 inches (2,810 mm), while 21 inch light alloy wheels lend an added flourish to the athletic bearing of this Sports Activity Coupe.

A face with an urban sporting presence
The front-end styling of the BMW Concept X4 exudes hallmark BMW dynamics and the rugged purpose and presence of a BMW SAV in equal measure. Classic BMW features
such as the kidney grille and stylized twin circular head-lights give the nose a clear identity and ensure it shines out as a BMW the first time you set eyes on it. The BMW Concept X4 lavishes both these front end design icons with meticulous detail and three-dimensional depth. The large kidney grille stretches out within a solid looking surround. The high gloss frame is open to the sides and at its lower extreme, lending it an almost "floating" appearance in the center of the nose.

The grille features prominently sculptured bars with ultra-stylish detailing. The hollowed out, high-gloss black bars have a milled lower third with a matt finishing, which lends the kidney structure extra visual depth. And the grille also comprises additional air apertures to ensure an increased supply of cooling air to the engine. The kidney grille is flanked by dynamically contoured full LED headlights. Inside the light units, a flowing, hexagonal interpretation of the familiar BMW twin circular appearance points to an unwavering focus on the road ahead. The horizontal continuation of the inner light elements creates a visual connection with the grille, accentuating once again the width of the nose.

This dynamic impression extends to the front apron. In keeping with BMW Coupe tradition, the side air intakes are larger than the inner horizontal bars and make a visual feature of the increased cooling air requirement, while satisfying that need. Together with the car's wide track and low center of gravity, the in-takes represent a promise of exceptional performance capability. The side air intakes pick up on a stylistic theme from the kidney grille; their black horizontal bars are, like the grille's, partly milled out but boast gleaming chrome edges. It all makes for an enticing contrast of materials, a fusion of high-end quality with the characteristic robustness of BMW X vehicles. This design theme concludes in the underside protection element, where three milled out, gleaming chrome elements present a high-quality take on the modern preference for minimalist solidity.

Side view with an extrovert edge
The qualities of a BMW SAV merge with the values of a BMW Coupe in the muscular silhouette of the BMW Concept X4. Its proportions present a persuasive case for the BMW
Concept X4 as the most dynamic vehicle in its segment. In hallmark BMW style, a longer wheelbase, relatively long bonnet, short over-hangs and a set-back greenhouse lend the car an undeniable dynamism even when standing still. The striking interplay of surfaces creates a vibrant contrast of light and shadow that exudes a feeling of agility and power. Prominently rising lines mould the flanks into a wedge shape and give the car as a whole a forward surging momentum.

The coupe style roofline sweeps elegantly downwards and makes the car appear longer. Below, the windows extend well to the rear, where they are bordered by a dynamic
interpretation of BMW's signature Hofmeister kink. The stretched and shallow band of glass creates a persuasively dynamic link between the greenhouse and vehicle body, the slim glass surface giving the body an impressively powerful appearance. At the same time the visual center of gravity is lowered, underlining the sporting mission statement summed up by the car's flanks.

The BMW Concept X4's contours include a new interpretation of the familiar BMW swage line, a pair of dynamic lines defining the eye-catching impact of the side view. A concave area under each swage line lends the flanks an almost sculptural expression – at once robust and dynamic. The surface volumes and definition of the contours deepen as they extend towards the tail and imbue the rear end with added stature. Here, the powerfully flared wheel arches team up with the concave surface below the rear swage line to visualize the power rippling through the rear wheels. The radiant exterior paint shade Long Beach Blue is a perfect match for the elaborately structured volumes and contours, and brings particular depth to the expressive design language.

Fitting the BMW X template, the wheel arches of the BMW Concept X4 are large and almost square in design. This prominent emphasis on the wheels draws further attention to the car's planted stance and long wheelbase, while at the same time providing a visual showcase for the xDrive intelligent all-wheel-drive system. The pared back, matt black protective cladding provides the final element of bodywork before the BMW Concept X4 meets the road.

Cutting-edge presence for the rear
The rear of the BMW Concept X4 takes the sporting, width-accentuating elements of the front-end design and reproduces them with an emphatically horizontal flavor. The body's lines and the slim LED tail lights positioned at the outer edges of the rear emphasize the muscular wheel arches and wide track. Below, horizontal lines split the rear visually into sections, while light surfaces re-duce the car's visual height and underline its width. The shallow rear window gives the vehicle body an even more powerful impression and its broad shoulders a show-stealing presence. Looking further down, the L-shaped rear lights of the BMW Concept X4 underscore its consummate stance on the road. A full-sized inner element in the tail lights, meanwhile, replicates the signature BMW "L" shape in three dimensional form and with impressive depth.

The most striking element at the back of the car is the rear apron, which provides a wide, full length interpretation of the front apron's large outer air intakes. The apron's cut out picks up the two exhaust tailpipes in a dynamic sweep before diverting the gaze to the wheels. Body color elements reaching well down towards the road surface provide a high quality border for the rear end and re emphasize the road focused proposition of the BMW Concept X4.

The underside protection acts as the body's lowest edge. Matte black surfaces lower the car's perceived height and accentuate the robust BMW X character of the rear. As at the front of the car, three milled elements in gleaming chrome add a sophisticated touch to the underside protection.

I like the Evoque exterior design (better than any X before the X4). Rumor has that it will recieve a facelift and larger power plant for 2015. We allmost bought one but decided it wasn't a good value next to the X3...then discovered the X1 and bought a X1 x28i M Sport.

My wife loves the X6 (me, not so much...plus it's too large and expensive for our needs). We are both in love with the X4 concept and are planning to exchange our 128i for an X4 eventually. We love the higher seat position of the X1 (it has done wonders for my bad back), while the driving dynamics render the X3 and Evoque unacceptable (we don't off-road or have a real winter here). As long as the X4 dynamics do not disappoint (i'm expecting something in between the X1 and X3). We will likely book a PC delivery of the X4 35i.

I'm definitely going to take a very close look at the X4 when it's available, hopefully not too far in the future. I do find the X3 to drive wonderfully. Not as tight as an X1, but better than any other SUV/Crossover that I've driven.